Stoughton not only demonstrates the "how" aspect of good editing but answers the questions "why" these rules apply. This book inspires, clarifies, nurtures and teaches, painlessly. It provides mental tools that are easy -- and dare I say it? -- fun to use to improve your writing and editing.
This book was good to work through as someone who is trying to learn more about the editing profession. I think an update version would prove more helpful as this one was published over a decade ago. But, it still offers great practice in copyediting.